Minor README updates.

Author: trekhleb

src/data-structures/bloom-filter/README.md

@@ -1,6 +1,6 @@
 # Bloom Filter
 
-A bloom filter is a space-efficient probabilistic 
+A **bloom filter** is a space-efficient probabilistic 
 data structure designed to test whether an element 
 is present in a set. It is designed to be blazingly 
 fast and use minimal memory at the cost of potential

src/data-structures/graph/README.md

@@ -1,6 +1,6 @@
 # Graph
 
-In computer science, a graph is an abstract data type 
+In computer science, a **graph** is an abstract data type 
 that is meant to implement the undirected graph and 
 directed graph concepts from mathematics, specifically
 the field of graph theory

src/data-structures/hash-table/README.md

@@ -1,9 +1,9 @@
 # Hash Table
 
-In computing, a hash table (hash map) is a data 
-structure which implements an associative array 
-abstract data type, a structure that can map keys 
-to values. A hash table uses a hash function to 
+In computing, a **hash table** (hash map) is a data 
+structure which implements an *associative array* 
+abstract data type, a structure that can *map keys 
+to values*. A hash table uses a *hash function* to 
 compute an index into an array of buckets or slots, 
 from which the desired value can be found
 

src/data-structures/heap/README.md

@@ -1,6 +1,6 @@
 # Heap (data-structure)
 
-In computer science, a heap is a specialized tree-based 
+In computer science, a **heap** is a specialized tree-based 
 data structure that satisfies the heap property described
 below.
 

src/data-structures/linked-list/README.md

@@ -1,6 +1,6 @@
 # Linked List
 
-In computer science, a linked list is a linear collection 
+In computer science, a **linked list** is a linear collection 
 of data elements, in which linear order is not given by 
 their physical placement in memory. Instead, each 
 element points to the next. It is a data structure 

src/data-structures/priority-queue/README.md

@@ -1,6 +1,6 @@
 # Priority Queue
 
-In computer science, a priority queue is an abstract data type 
+In computer science, a **priority queue** is an abstract data type 
 which is like a regular queue or stack data structure, but where 
 additionally each element has a "priority" associated with it. 
 In a priority queue, an element with high priority is served before 

src/data-structures/queue/README.md

@@ -1,6 +1,6 @@
 # Queue
 
-In computer science, a queue is a particular kind of abstract data 
+In computer science, a **queue** is a particular kind of abstract data 
 type or collection in which the entities in the collection are 
 kept in order and the principle (or only) operations on the 
 collection are the addition of entities to the rear terminal 

src/data-structures/stack/README.md

@@ -1,6 +1,6 @@
 # Stack
 
-In computer science, a stack is an abstract data type that serves 
+In computer science, a **stack** is an abstract data type that serves 
 as a collection of elements, with two principal operations:
 
 * **push**, which adds an element to the collection, and

src/data-structures/tree/README.md

@@ -6,7 +6,7 @@
 * [Segment Tree](segment-tree) - with min/max/sum range queries examples
 * [Fenwick Tree](fenwick-tree) (Binary Indexed Tree)
 
-In computer science, a tree is a widely used abstract data 
+In computer science, a **tree** is a widely used abstract data 
 type (ADT) — or data structure implementing this ADT—that 
 simulates a hierarchical tree structure, with a root value 
 and subtrees of children with a parent node, represented as 

src/data-structures/tree/avl-tree/README.md

@@ -1,6 +1,6 @@
 # AVL Tree
 
-In computer science, an AVL tree (named after inventors 
+In computer science, an **AVL tree** (named after inventors 
 Adelson-Velsky and Landis) is a self-balancing binary search 
 tree. It was the first such data structure to be invented. 
 In an AVL tree, the heights of the two child subtrees of any